[alsa-devel] [PATCH] [v2] ASoC: add support for the Freescale / iVeia P1022 RDK reference board
Timur Tabi
timur at freescale.com
Fri Oct 12 21:09:18 CEST 2012
This small reference boards has a Freescale P1022 dual-core PowerPC SOC
and a Wolfson Microelectronics WM8960 codec.
Signed-off-by: Timur Tabi <timur at freescale.com>
---
sound/soc/fsl/Kconfig | 14 ++
sound/soc/fsl/Makefile | 4 +
sound/soc/fsl/p1022_rdk.c | 392 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 410 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/fsl/p1022_rdk.c
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 4563b28..8e48432 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -46,6 +46,20 @@ config SND_SOC_P1022_DS
This will also include the Wolfson Microelectronics WM8776 codec
driver.
+config SND_SOC_P1022_RDK
+ tristate "ALSA SoC support for the Freescale / iVeia P1022 RDK board"
+ # I2C is necessary for the WM8960 driver
+ depends on P1022_RDK && I2C
+ select SND_SOC_FSL_SSI
+ select SND_SOC_FSL_UTILS
+ select SND_SOC_POWERPC_DMA
+ select SND_SOC_WM8960
+ default y if P1022_RDK
+ help
+ Say Y if you want to enable audio on the Freescale / iVeia
+ P1022 RDK board. This will also include the Wolfson
+ Microelectronics WM8960 codec driver.
+
config SND_SOC_MPC5200_I2S
tristate "Freescale MPC5200 PSC in I2S mode driver"
depends on PPC_MPC52xx && PPC_BESTCOMM
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index 5f3cf3f..515ba66 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -6,6 +6,10 @@ obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += snd-soc-mpc8610-hpcd.o
snd-soc-p1022-ds-objs := p1022_ds.o
obj-$(CONFIG_SND_SOC_P1022_DS) += snd-soc-p1022-ds.o
+# P1022 RDK Machine Support
+snd-soc-p1022-rdk-objs := p1022_rdk.o
+obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o
+
# Freescale PowerPC SSI/DMA Platform Support
snd-soc-fsl-ssi-objs := fsl_ssi.o
snd-soc-fsl-utils-objs := fsl_utils.o
diff --git a/sound/soc/fsl/p1022_rdk.c b/sound/soc/fsl/p1022_rdk.c
new file mode 100644
index 0000000..897e32f
--- /dev/null
+++ b/sound/soc/fsl/p1022_rdk.c
@@ -0,0 +1,392 @@
+/**
+ * Freescale P1022RDK ALSA SoC Machine driver
+ *
+ * Author: Timur Tabi <timur at freescale.com>
+ *
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ * Note: in order for audio to work correctly, the output controls need
+ * to be enabled, because they control the clock. So for playback, for
+ * example:
+ *
+ * amixer sset 'Left Output Mixer PCM' on
+ * amixer sset 'Right Output Mixer PCM' on
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <asm/fsl_guts.h>
+
+#include "fsl_dma.h"
+#include "fsl_ssi.h"
+#include "fsl_utils.h"
+
+/* P1022-specific PMUXCR and DMUXCR bit definitions */
+
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
+#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
+
+#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
+#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
+
+#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
+#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
+
+/*
+ * Set the DMACR register in the GUTS
+ *
+ * The DMACR register determines the source of initiated transfers for each
+ * channel on each DMA controller. Rather than have a bunch of repetitive
+ * macros for the bit patterns, we just have a function that calculates
+ * them.
+ *
+ * guts: Pointer to GUTS structure
+ * co: The DMA controller (0 or 1)
+ * ch: The channel on the DMA controller (0, 1, 2, or 3)
+ * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
+ */
+static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
+ unsigned int co, unsigned int ch, unsigned int device)
+{
+ unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
+
+ clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
+}
+
+/* There's only one global utilities register */
+static phys_addr_t guts_phys;
+
+/**
+ * machine_data: machine-specific ASoC device data
+ *
+ * This structure contains data for a single sound platform device on an
+ * P1022 RDK. Some of the data is taken from the device tree.
+ */
+struct machine_data {
+ struct snd_soc_dai_link dai[2];
+ struct snd_soc_card card;
+ unsigned int dai_format;
+ unsigned int codec_clk_direction;
+ unsigned int cpu_clk_direction;
+ unsigned int clk_frequency;
+ unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
+ unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
+ char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
+};
+
+/**
+ * p1022_rdk_machine_probe: initialize the board
+ *
+ * This function is used to initialize the board-specific hardware.
+ *
+ * Here we program the DMACR and PMUXCR registers.
+ */
+static int p1022_rdk_machine_probe(struct snd_soc_card *card)
+{
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+ struct ccsr_guts __iomem *guts;
+
+ guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
+ if (!guts) {
+ dev_err(card->dev, "could not map global utilities\n");
+ return -ENOMEM;
+ }
+
+ /* Enable SSI Tx signal */
+ clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
+ CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
+
+ /* Enable SSI Rx signal */
+ clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
+ CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
+
+ /* Enable DMA Channel for SSI */
+ guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
+ CCSR_GUTS_DMUXCR_SSI);
+
+ guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
+ CCSR_GUTS_DMUXCR_SSI);
+
+ iounmap(guts);
+
+ return 0;
+}
+
+/**
+ * p1022_rdk_startup: program the board with various hardware parameters
+ *
+ * This function takes board-specific information, like clock frequencies
+ * and serial data formats, and passes that information to the codec and
+ * transport drivers.
+ */
+static int p1022_rdk_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct machine_data *mdata =
+ container_of(rtd->card, struct machine_data, card);
+ struct device *dev = rtd->card->dev;
+ int ret = 0;
+
+ /* Tell the codec driver what the serial protocol is. */
+ ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
+ if (ret < 0) {
+ dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
+ ret);
+ return ret;
+ }
+
+ ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
+ mdata->clk_frequency);
+ if (ret < 0) {
+ dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * p1022_rdk_machine_remove: Remove the sound device
+ *
+ * This function is called to remove the sound device for one SSI. We
+ * de-program the DMACR and PMUXCR register.
+ */
+static int p1022_rdk_machine_remove(struct snd_soc_card *card)
+{
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+ struct ccsr_guts __iomem *guts;
+
+ guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
+ if (!guts) {
+ dev_err(card->dev, "could not map global utilities\n");
+ return -ENOMEM;
+ }
+
+ /* Restore the signal routing */
+ clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
+ clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
+ guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
+ guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
+
+ iounmap(guts);
+
+ return 0;
+}
+
+/**
+ * p1022_rdk_ops: ASoC machine driver operations
+ */
+static struct snd_soc_ops p1022_rdk_ops = {
+ .startup = p1022_rdk_startup,
+};
+
+/**
+ * p1022_rdk_probe: platform probe function for the machine driver
+ *
+ * Although this is a machine driver, the SSI node is the "master" node with
+ * respect to audio hardware connections. Therefore, we create a new ASoC
+ * device for each new SSI node that has a codec attached.
+ */
+static int p1022_rdk_probe(struct platform_device *pdev)
+{
+ struct device *dev = pdev->dev.parent;
+ /* ssi_pdev is the platform device for the SSI node that probed us */
+ struct platform_device *ssi_pdev =
+ container_of(dev, struct platform_device, dev);
+ struct device_node *np = ssi_pdev->dev.of_node;
+ struct device_node *codec_np = NULL;
+ struct machine_data *mdata;
+ const u32 *iprop;
+ int ret;
+
+ /* Find the codec node for this SSI. */
+ codec_np = of_parse_phandle(np, "codec-handle", 0);
+ if (!codec_np) {
+ dev_err(dev, "could not find codec node\n");
+ return -EINVAL;
+ }
+
+ mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
+ if (!mdata) {
+ ret = -ENOMEM;
+ goto error_put;
+ }
+
+ mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
+ mdata->dai[0].ops = &p1022_rdk_ops;
+
+ /* ASoC core can match codec with device node */
+ mdata->dai[0].codec_of_node = codec_np;
+
+ /*
+ * We register two DAIs per SSI, one for playback and the other for
+ * capture. We support codecs that have separate DAIs for both playback
+ * and capture.
+ */
+ memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
+
+ /* The DAI names from the codec (snd_soc_dai_driver.name) */
+ mdata->dai[0].codec_dai_name = "wm8960-hifi";
+ mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
+
+ /*
+ * Configure the SSI for I2S slave mode. Older device trees have
+ * an fsl,mode property, but we ignore that since there's really
+ * only one way to configure the SSI.
+ */
+ mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
+ mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
+ mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
+
+ /*
+ * In i2s-slave mode, the codec has its own clock source, so we
+ * need to get the frequency from the device tree and pass it to
+ * the codec driver.
+ */
+ iprop = of_get_property(codec_np, "clock-frequency", NULL);
+ if (!iprop || !*iprop) {
+ dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ mdata->clk_frequency = be32_to_cpup(iprop);
+
+ if (!mdata->clk_frequency) {
+ dev_err(&pdev->dev, "unknown clock frequency\n");
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /* Find the playback DMA channel to use. */
+ mdata->dai[0].platform_name = mdata->platform_name[0];
+ ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
+ &mdata->dma_channel_id[0],
+ &mdata->dma_id[0]);
+ if (ret) {
+ dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
+ ret);
+ goto error;
+ }
+
+ /* Find the capture DMA channel to use. */
+ mdata->dai[1].platform_name = mdata->platform_name[1];
+ ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
+ &mdata->dma_channel_id[1],
+ &mdata->dma_id[1]);
+ if (ret) {
+ dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
+ ret);
+ goto error;
+ }
+
+ /* Initialize our DAI data structure. */
+ mdata->dai[0].stream_name = "playback";
+ mdata->dai[1].stream_name = "capture";
+ mdata->dai[0].name = mdata->dai[0].stream_name;
+ mdata->dai[1].name = mdata->dai[1].stream_name;
+
+ mdata->card.probe = p1022_rdk_machine_probe;
+ mdata->card.remove = p1022_rdk_machine_remove;
+ mdata->card.name = pdev->name; /* The platform driver name */
+ mdata->card.owner = THIS_MODULE;
+ mdata->card.dev = &pdev->dev;
+ mdata->card.num_links = 2;
+ mdata->card.dai_link = mdata->dai;
+
+ /* Register with ASoC */
+ ret = snd_soc_register_card(&mdata->card);
+ if (ret) {
+ dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ kfree(mdata);
+error_put:
+ of_node_put(codec_np);
+ return ret;
+}
+
+/**
+ * p1022_rdk_remove: remove the platform device
+ *
+ * This function is called when the platform device is removed.
+ */
+static int __devexit p1022_rdk_remove(struct platform_device *pdev)
+{
+ struct snd_soc_card *card = platform_get_drvdata(pdev);
+ struct machine_data *mdata =
+ container_of(card, struct machine_data, card);
+
+ snd_soc_unregister_card(card);
+ kfree(mdata);
+
+ return 0;
+}
+
+static struct platform_driver p1022_rdk_driver = {
+ .probe = p1022_rdk_probe,
+ .remove = __devexit_p(p1022_rdk_remove),
+ .driver = {
+ /*
+ * The name must match 'compatible' property in the device tree,
+ * in lowercase letters.
+ */
+ .name = "snd-soc-p1022rdk",
+ .owner = THIS_MODULE,
+ },
+};
+
+/**
+ * p1022_rdk_init: machine driver initialization.
+ *
+ * This function is called when this module is loaded.
+ */
+static int __init p1022_rdk_init(void)
+{
+ struct device_node *guts_np;
+ struct resource res;
+
+ /* Get the physical address of the global utilities registers */
+ guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
+ if (of_address_to_resource(guts_np, 0, &res)) {
+ pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
+ of_node_put(guts_np);
+ return -EINVAL;
+ }
+ guts_phys = res.start;
+ of_node_put(guts_np);
+
+ return platform_driver_register(&p1022_rdk_driver);
+}
+
+/**
+ * p1022_rdk_exit: machine driver exit
+ *
+ * This function is called when this driver is unloaded.
+ */
+static void __exit p1022_rdk_exit(void)
+{
+ platform_driver_unregister(&p1022_rdk_driver);
+}
+
+late_initcall(p1022_rdk_init);
+module_exit(p1022_rdk_exit);
+
+MODULE_AUTHOR("Timur Tabi <timur at freescale.com>");
+MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
+MODULE_LICENSE("GPL v2");
--
1.7.3.4
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